Main2Activity.java
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package com.example.monika.amextask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
public class Main2Activity extends AppCompatActivity {
EditText editText;
String keys,nodes="";
TextView txtAns1;
List<String> StringPos;
List<String> Stringkeys;
HashMap<Integer, String> StringVal;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
editText=(EditText)findViewById(R.id.editText2);
txtAns1 =(TextView)findViewById(R.id.txtcount);
StringPos = new ArrayList<String>();
Stringkeys = new ArrayList<String>();
}
public void getNodes(View view){
keys=editText.getText().toString();
StringPos = Arrays.asList(keys.split(","));
createArr();
for(int i=0;i<StringPos.size();i++){
int pos= Integer.valueOf(StringPos.get(i));
nodes+=StringVal.get(pos-1);
}
System.out.println(countUniqueCharacters(nodes));
txtAns1.setText(countUniqueCharacters(nodes)+"");
}
void createArr(){
StringVal = new HashMap<Integer, String>();
int i=0;
while(i<50){
for (char letter = 'A'; letter <= 'G'; letter++){
StringVal.put(i,""+letter);
i++;
if(i==50)
break;
}
}
}
public static int countUniqueCharacters(String input) {
String buffer = "";
for (int i = 0; i < input.length(); i++) {
if (!buffer.contains(String.valueOf(input.charAt(i)))) {
buffer += input.charAt(i);
}
}
return buffer.length();
}
String checkNode(String sToPrint){
for(int i = 0; i < sToPrint.length(); i ++){
char c = sToPrint.charAt(i);
int occurences = 1;
if(i <= sToPrint.length() - 2) {
for (int i2 = i + 1; i2 < sToPrint.length(); i2 ++){
char c2 = sToPrint.charAt(i2);
if(c2 == c)
occurences += 1;
else{
i += occurences - 1;
break;
}
}
}
else
break; //we are on our last char
System.out.println(String.valueOf(occurences) + String.valueOf(c));
if(occurences>1){
return "yes";
}
else
return "no";
}
return "";
}
}